CN115071064A

CN115071064A - Injection molding machine for producing PE pipeline connection prefabricated parts

Info

Publication number: CN115071064A
Application number: CN202210850015.1A
Authority: CN
Inventors: 魏茂强; 宋述兵; 王东
Original assignee: Zibo Institute Of Product Quality Inspection; Shandong Wanji Plastic Co ltd
Current assignee: Zibo Institute Of Product Quality Inspection; Shandong Wanji Plastic Co ltd
Priority date: 2022-07-20
Filing date: 2022-07-20
Publication date: 2022-09-20
Anticipated expiration: 2042-07-20
Also published as: CN115071064B

Abstract

The invention relates to the technical field of injection molding machines, and discloses an injection molding machine for producing PE pipeline connection prefabricated parts. This injection molding machine of prefab production usefulness is connected to PE pipeline, V-arrangement lever sled piece contacts in advance the L-shaped groove that the piece was seted up to spacing the piece of supporting in equipment main part shell inner wall both sides and under the effect of spacing the restriction of piece of supporting the piece down the surface production rotation of the spliced pole of the inside fixed joint of fixed slot that first connecting plate top fixed block was seted up of V-arrangement lever sled piece, thereby make the other end of V-arrangement lever sled piece produce the sled to the third connecting plate and move, four top push rods of the in-process third connecting plate top fixed mounting of sled get into by the ejecting groove of bed die shell bottom, carry out ejecting with the inside finished product of accomplishing of moulding plastics of bed die shell, the in-process of whole operation utilizes the principle of lever to realize ejecting fast to finished product in the mould, improve the speed and the efficiency of drawing of patterns.

Description

Injection molding machine for producing PE pipeline connection prefabricated parts

Technical Field

The invention relates to the technical field of injection molding machines, in particular to an injection molding machine for producing PE pipeline connection prefabricated parts.

Background

The PE pipeline is also called polyethylene pipe, it is a water supply pipe material which uses polyethylene resin as main raw material and is formed by extrusion, it is applicable to indoor and outdoor low-temperature water supply pipelines, and the butt joint between PE pipelines needs to use pipeline connecting piece, it can butt-joint two pipelines to ensure the connection place is tight and does not produce water leakage, and the production of PE pipeline connection prefabricated member needs to use injection machine, injection molding machine also called injection molding machine or injection machine, it is the main forming equipment which uses thermoplastic plastics or thermosetting plastics to make plastic products with various shapes by using plastic forming mould, in the course of producing PE pipeline connection prefabricated member by using injection molding piece, because the thermoplastic plastics or thermosetting plastics are injected into the mould and then cooled, the adhesion is easily formed in the interior of mould in the cooling course, the difficulty of demoulding is increased, meanwhile, the injection molding machine performs the next injection molding after the upper mold and the lower mold are butted and attached, the butt joint part is not tight easily in the butt joint process, so that the thermoplastic plastics or the thermosetting plastics in the mold overflow, the defective rate is increased, meanwhile, the thermoplastic plastics or the thermosetting plastics generate high temperature when being injected into the mold, the high temperature can influence the working state of workers, and the integral working efficiency is reduced.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the injection molding machine for producing the PE pipeline connection prefabricated part, which has the advantages of quickly ejecting out a mold, quickly fastening and connecting tightly to prevent overflow and heat blockage, and solves the problems in the background technology.

The invention provides the following technical scheme: an injection molding machine for producing PE pipeline connection prefabricated parts comprises a main body shell of equipment and a connecting vertical plate, the bottom end of the inner part of the device main body shell is provided with a first connecting plate, the bottom of the first connecting plate is provided with an electric telescopic rod, the top of the first connecting plate is fixedly connected with two fixing blocks, the side surfaces of the two fixing blocks are both provided with fixing grooves, the inside of the fixed groove is fixedly clamped with a connecting column, two ends of the connecting column are respectively fixedly clamped with two limiting clamping pieces, the side surfaces of the two limiting clamping pieces are provided with V-shaped lever prying blocks, the inner part of the V-shaped lever prying block is movably connected with a connecting column, the top of the first connecting plate is fixedly connected with a second connecting plate, the top of second connecting plate is provided with four support gasket, four the top laminating of fixed slot has the third connecting plate, the top of third connecting plate is provided with four top and moves the push rod.

Preferably, the top of the outer shell of the main body of the equipment is fixedly connected with two connecting vertical plates, the side surfaces of the two connecting vertical plates are both provided with wall grooves, the interior of the wall groove is connected with a linkage plate in a sliding way, the side surface of the linkage plate is fixedly provided with an upper mould shell, extension clamping plates are respectively and fixedly arranged on two sides of the upper die shell, buckling grooves are formed in the side faces of the extension clamping plates, the inner part of the device main body shell is fixedly clamped with a lower die shell, two sides of the lower die shell are respectively and fixedly connected with an extension square block, an extension cylinder is movably connected inside the extension block, a connection inclined block is fixedly connected on the surface of the extension cylinder, the side fixing clamping of connecting the sloping block has the lock joint piece, the side fixed mounting of lock joint piece has the second spring, the opposite side fixedly connected with bed die shell of second spring.

Preferably, the two sides of the connecting vertical plate are respectively provided with a high-temperature separation device, the high-temperature separation device comprises a temperature separation shell, a sliding block, a sliding groove, a first magnetic adsorption block and a second magnetic adsorption block, the sliding groove is formed in the side face of the connecting vertical plate, the sliding block is connected inside the sliding groove in a sliding mode, the temperature separation shell is fixedly installed on the side face of the sliding block, the second magnetic adsorption block is arranged on the two sides of the inner wall of the temperature separation shell, the first magnetic adsorption block is arranged on the side face of the second magnetic adsorption block, and the connecting vertical plate is fixedly connected to the bottom of the first magnetic adsorption block.

Preferably, the bottom of the device main body shell is fixedly connected with four connecting supporting legs, and the bottoms of the four connecting supporting legs are provided with rollers.

Preferably, the bottom of the device main body shell is fixedly connected with two extension fixing rods, the side faces of the two extension fixing rods are fixedly provided with electric telescopic rods, two sides of the inner wall of the device main body shell are respectively and fixedly provided with a limiting abutting block, and the side face of the limiting abutting block is provided with an L-shaped groove.

Preferably, a first spring is fixedly installed on one side of the inner wall of the wall groove, and a linkage plate is fixedly connected to the other side of the first spring.

Preferably, four ejecting grooves are formed in the bottom of the lower die shell, and ejecting push rods are attached to the inner portions of the ejecting grooves.

Compared with the prior art, the invention has the following beneficial effects:

1. the injection molding machine for producing the PE pipeline connection prefabricated part controls the electric telescopic rod to generate upward jacking force on the first connecting plate through the electric telescopic rod, the connecting column, the V-shaped lever prying block, the limiting clamping piece, the fixing block, the fixing groove, the jacking push rod, the L-shaped groove and the limiting abutting block, and in the jacking and lifting process, the V-shaped lever prying block is in contact with the L-shaped groove formed in the limiting abutting block on two sides of the inner wall of the main body shell of the equipment in advance and rotates on the surface of the connecting column fixedly clamped in the fixing groove formed in the fixing block at the top of the first connecting plate under the limiting action of the limiting abutting block, so that the other end of the V-shaped lever prying block is used for prying the third connecting plate, four jacking push rods fixedly installed at the top of the third connecting plate enter from the ejection grooves at the bottom of the lower die shell in the prying process, and ejecting a finished product which is subjected to injection molding in the lower die shell, meanwhile, the limiting clamping piece limits the V-shaped lever prying block to avoid falling off, the principle of the lever is utilized to realize quick ejection of finished products in the die in the whole operation process, and the speed and the efficiency of demolding are improved.

2. This injection molding machine of prefab production usefulness is connected to PE pipeline, through first spring, the lock joint groove, extend the cardboard, the linkage plate, extend the square, extend the cylinder, connect the sloping block, second spring and lock joint block, mould shell descends in the control, the first spring of the fixed mounting in the middle and upper mould shell both sides linkage plate top stretches in the wall inslot portion that the connection riser was seted up in the decline in-process, the middle and upper mould shell both sides of decline extend the cardboard and contact in advance to the lower mould shell both sides extend the lock joint block of the fixed mounting in the connection sloping block side that the square inside swing joint's that extends cylinder fixed surface connects, produce inside extrusion rotation to the lock joint block, thereby produce the extrusion to the second spring of lock joint block side, the lock joint groove that the cardboard was seted up is extended to upper mould shell both sides is in same horizontal position with the lock joint block, after the restriction that the second spring loses power, the lock joint block kick-back and block is inside the lock joint groove that extends the cardboard and accomplish lower mould shell and upper mould shell outside the upper mould The butt joint installation of shell, the compactness of connecting is high, is making the in-process of bed die shell and last mould shell separation simultaneously, and quick resilience can be carried out to first spring, improves the convenience of using.

3. The injection molding machine for producing the PE pipeline connection prefabricated part is characterized in that a temperature separation shell, a sliding block, a sliding groove, a first magnetic adsorption block and a second magnetic adsorption block are arranged, the sliding block fixedly connected with the inner wall is controlled by the temperature separation shell to slide in the sliding groove formed in a connecting vertical plate fixedly connected with the top of an equipment main body shell, so that the temperature separation shell can be lowered and positioned around a lower mould shell and an upper mould shell, the high temperature generated in the injection molding process of the lower mould shell and the upper mould shell is separated, the high temperature of the working environment caused by the direct dissipation of heat is avoided, meanwhile, in the demolding process, the sliding block fixedly connected with the inner wall of the temperature separation shell is lifted in the sliding groove formed in the connecting vertical plate fixedly connected with the top of the equipment main body shell, the second magnetic adsorption block arranged on the inner wall of the temperature separation shell is in the lifting process and is in contact with the first magnetic adsorption block arranged on the top of the connecting vertical plate to generate magnetic attraction, thereby fix the temperature separation shell, conveniently carry out the operation of drawing of patterns, effectually carry out the separation to the produced high temperature of the in-process of moulding plastics, guarantee that operational environment temperature is in suitable state, improve the comfort level of staff's work, guarantee the efficiency of work.

Drawings

FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention;

FIG. 2 is a schematic top view of the structure of FIG. 1 according to the present invention;

FIG. 3 is a schematic diagram of a portion of the structure of FIG. 1 in accordance with the present invention;

FIG. 4 is a schematic view of a portion of FIG. 1 according to the present invention;

FIG. 5 is an enlarged view of the structure at A in FIG. 3 according to the present invention;

FIG. 6 is a bottom view of the structure of FIG. 4 according to the present invention.

In the figure: 1. an apparatus main body casing; 2. an extension fixing rod; 3. connecting the supporting legs; 4. a roller; 5. an electric telescopic rod; 6. a lower mold housing; 7. an upper mold housing; 8. connecting a vertical plate; 9. a temperature barrier shell; 10. a high temperature barrier device; 11. a slider; 12. a chute; 13. a wall groove; 14. a first spring; 15. a first adsorbed magnet block; 16. a second attracted magnet mass; 17. a linkage plate; 18. a fastening groove; 19. extending the clamping plate; 20. connecting columns; 21. pushing the push rod; 22. an L-shaped slot; 23. a fixed block; 24. a fixing groove; 25. a first connecting plate; 26. the V-shaped lever prizes the block; 27. a limiting abutting block; 28. an extension block; 29. an extension cylinder; 30. connecting the inclined blocks; 31. a second spring; 32. a buckling block; 33. ejecting the groove; 34. a support pad; 35. a second connecting plate; 36. a limiting clamping piece; 37. and a third connecting plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the injection molding machine for producing the PE pipe connection prefabricated parts comprises an equipment main body casing 1 and a connecting vertical plate 8, wherein a first connecting plate 25 is arranged at the bottom end inside the equipment main body casing 1, an electric telescopic rod 5 is arranged at the bottom of the first connecting plate 25, two fixing blocks 23 are fixedly connected to the top of the first connecting plate 25, fixing grooves 24 are respectively formed in the side surfaces of the two fixing blocks 23, a connecting column 20 is fixedly clamped inside the fixing grooves 24, two limit clamping pieces 36 are respectively fixedly clamped at the two ends of the connecting column 20, a V-shaped lever prying block 26 is arranged on the side surfaces of the two limit clamping pieces 36, the connecting column 20 is movably connected inside the V-shaped lever prying block 26, a second connecting plate 35 is fixedly connected to the top of the first connecting plate 25, four supporting gaskets 34 are arranged at the top of the second connecting plate 35, and a third connecting plate 37 is attached to the tops of the four fixing grooves 24, the top of the third connecting plate 37 is provided with four pushing push rods 21, the V-shaped lever prying block 26 contacts with the L-shaped grooves 22 formed in the limit abutting blocks 27 on the two sides of the inner wall of the main body housing 1 in advance, and the V-shaped lever prying block 26 rotates on the surface of the connecting column 20 fixedly clamped inside the fixing groove 24 formed in the fixing block 23 on the top of the first connecting plate 25 under the limiting action of the limit abutting blocks 27, so that the other end of the V-shaped lever prying block 26 prys the third connecting plate 37, the four pushing push rods 21 fixedly mounted on the top of the third connecting plate 37 enter from the pushing groove 33 at the bottom of the lower mold housing 6 in the prying process, the finished product injection-molded inside the lower mold housing 6 is pushed out, meanwhile, the limit clamping piece 36 limits the V-shaped lever prying block 26 to avoid falling off, and the finished product in the mold is quickly pushed out by using the lever principle in the whole operation process, the speed and the efficiency of demoulding are improved.

Wherein; riser 8 is connected to two top fixedly connected with of equipment main body shell 1, wall groove 13 has all been seted up to two sides of connecting riser 8, the inside sliding connection of wall groove 13 has linkage plate 17, linkage plate 17 side fixed mounting has last mould shell 7, the both sides of going up mould shell 7 fixed mounting respectively have extension cardboard 19, buckle groove 18 has been seted up to the side of extending cardboard 19, the inside fixed joint of equipment main body shell 1 has lower mould shell 6, the both sides of lower mould shell 6 are fixedly connected with respectively and extend square 28, the inside swing joint that extends square 28 has extension cylinder 29, the fixed surface that extends cylinder 29 is connected with connects sloping block 30, the side fixed joint that connects sloping block 30 has buckle piece 32, buckle piece 32's side fixed mounting has second spring 31, the opposite side fixedly connected with lower mould shell 6 of second spring 31.

Wherein; connect the both sides of riser 8 and be provided with high temperature separation device 10 respectively, high temperature separation device 10 is including temperature separation shell 9, slider 11, spout 12, first adsorbed magnet piece 15 and second adsorbed magnet piece 16, spout 12 has been seted up to the side of connecting riser 8, the inside sliding connection of spout 12 has slider 11, the side fixed mounting of slider 11 has temperature separation shell 9, the both sides of temperature separation shell 9 inner wall are provided with the second respectively and adsorb magnet piece 16, the side that the second adsorbed magnet piece 16 is provided with first adsorbed magnet piece 15, the bottom fixedly connected with of first adsorbed magnet piece 15 connects riser 8.

Wherein; four connecting leg 3 of bottom fixedly connected with of equipment main body shell 1, the bottom of four connecting leg 3 all is provided with gyro wheel 4, utilize the inside slip of spout 12 that slider 11 of temperature separation shell 9 control inner wall fixed connection set up at 1 top fixed connection's of equipment main body shell connection riser 8, thereby can drop temperature separation shell 9 and be located down mould shell 6 and go up mould shell 7 around, carry out the separation to produced high temperature of mould shell 6 and last mould shell 7 in-process of moulding plastics, it leads to operational environment's temperature height to avoid heat direct giving off, simultaneously in-process at the needs of carrying out the drawing of patterns, the spout 12 that slider 11 of utilizing temperature separation shell 9 inner wall fixed connection set up at 1 top fixed connection's of equipment main body shell is inside to be risen, the in-process temperature separation shell 9 inner wall set up second adsorbs magnet block 16 and is inhaled the magnet block 15 contact production magnetism and is inhaled with the first magnet block that is connected riser 8 top and is set up to rise the in-process temperature separation shell 9 inner wall setting Thereby fix temperature separation shell 9, conveniently carry out the operation of drawing of patterns, effectually carry out the separation to the produced high temperature of the in-process of moulding plastics, guarantee that operational environment temperature is in suitable state, improve the comfort level of staff's work, guarantee the efficiency of work.

Wherein; two extension dead levers 2 of bottom fixedly connected with of equipment main part shell 1, two side fixed mounting that extend dead lever 2 have electric telescopic handle 5, and the both sides of equipment main part shell 1 inner wall are fixed mounting respectively have spacing piece 27 of supporting, and L-shaped groove 22 has been seted up to spacing side of supporting piece 27.

Wherein; a first spring 14 is fixedly arranged on one side of the inner wall of the wall groove 13, and a linkage plate 17 is fixedly connected to the other side of the first spring 14.

Wherein; four ejecting grooves 33 are formed in the bottom of the lower die shell 6, and ejecting push rods 21 are attached to the insides of the four ejecting grooves 33.

The working principle is that in the working process, a worker controls the upper die shell 7 to descend, the first springs 14 fixedly arranged at the tops of the linkage plates 17 at two sides of the upper die shell 7 are stretched in the wall grooves 13 formed in the connecting vertical plates 8 in the descending process, the extension clamping plates 19 at two sides of the upper die shell 7 are in contact with the buckling blocks 32 fixedly arranged at the side surfaces of the connecting inclined blocks 30 fixedly connected with the surfaces of the extension cylinders 29 movably connected in the extension blocks 28 at two sides of the lower die shell 6 in advance in the descending process, the buckling blocks 32 are inwards extruded and rotated, so that the second springs 31 at the side surfaces of the buckling blocks 32 are extruded until the buckling grooves 18 formed in the extension clamping plates 19 at two sides of the upper die shell 7 and the buckling blocks 32 are positioned at the same horizontal position, after the second springs 31 lose the force limitation, the buckling blocks 32 rebound and are clamped in the buckling grooves 18 formed in the extension clamping plates 19 to complete the butt joint installation of the lower die shell 6 and the upper die shell 7, then thermoplastic plastics or thermosetting plastics are injected into the lower die shell 6 and the upper die shell 7, the temperature separation shell 9 is used for controlling the slide block 11 fixedly connected with the inner wall to slide in the chute 12 formed by the connecting vertical plate 8 fixedly connected with the top of the device main body shell 1, so that the temperature separation shell 9 can be lowered and positioned at the periphery of the lower die shell 6 and the upper die shell 7, the high temperature generated in the injection molding process of the lower die shell 6 and the upper die shell 7 is separated, the high temperature of the working environment caused by the direct dissipation of heat is avoided, meanwhile, in the process of demolding, the slide block 11 fixedly connected with the inner wall of the temperature separation shell 9 is lifted in the chute 12 formed by the connecting vertical plate 8 fixedly connected with the top of the device main body shell 1, the second magnetic absorption block 16 arranged on the inner wall of the temperature separation shell 9 in the lifting process is contacted with the first magnetic absorption block 15 arranged on the top of the connecting vertical plate 8 to generate magnetic absorption, thereby fix temperature separation shell 9, carry out the operation of drawing of patterns on next step, control electric telescopic handle 5 produces ascending top power to first connecting plate 25, the in-process that the top was moved and is risen, V-arrangement lever sled piece 26 contacts in advance to the L shape groove 22 that the piece 27 was seted up to spacing supporting in equipment main part shell 1 inner wall both sides and under the effect of spacing supporting the piece 27 restriction, V-arrangement lever sled piece 26 produces the rotation at the fixed slot 24 inside fixed joint's that the fixed block 23 was seted up in first connecting plate 25 top spliced pole 20 surface, thereby make the other end of V-arrangement lever sled piece 26 produce the prizing to third connecting plate 37, four top push rods 21 of the fixed mounting at third connecting plate 37 top of prizing get into by the ejecting groove 33 of lower mould shell 6 bottom, the finished product of moulding plastics completion inside lower mould shell 6 is ejecting.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

The injection molding machine for producing the PE pipeline connection prefabricated part is characterized by comprising an equipment main body shell (1) and a connecting vertical plate (8), wherein a first connecting plate (25) is arranged at the bottom end inside the equipment main body shell (1), an electric telescopic rod (5) is arranged at the bottom of the first connecting plate (25), two fixing blocks (23) are fixedly connected to the top of the first connecting plate (25), fixing grooves (24) are formed in the side faces of the two fixing blocks (23), a connecting column (20) is fixedly clamped inside the fixing grooves (24), two limiting clamping pieces (36) are fixedly clamped at the two ends of the connecting column (20) respectively, a V-shaped lever prying block (26) is arranged on the side face of each limiting clamping piece (36), a connecting column (20) is movably connected inside the V-shaped lever prying block (26), and a second connecting plate (35) is fixedly connected to the top of the first connecting plate (25), the top of second connecting plate (35) is provided with four support gasket (34), and four the top laminating of fixed slot (24) has third connecting plate (37), the top of third connecting plate (37) is provided with four top and moves push rod (21).
2. An injection molding machine for producing PE pipe connection preforms according to claim 1, wherein: the top of the equipment main body shell (1) is fixedly connected with two connecting vertical plates (8), the side surfaces of the two connecting vertical plates (8) are respectively provided with a wall groove (13), the inside of the wall groove (13) is slidably connected with a linkage plate (17), the side surface of the linkage plate (17) is fixedly provided with an upper mould shell (7), the two sides of the upper mould shell (7) are respectively and fixedly provided with an extending clamping plate (19), the side surface of the extending clamping plate (19) is provided with a buckling groove (18), the inside of the equipment main body shell (1) is fixedly clamped with a lower mould shell (6), the two sides of the lower mould shell (6) are respectively and fixedly connected with extending blocks (28), the inside of each extending block (28) is movably connected with an extending cylinder (29), the surface of each extending cylinder (29) is fixedly connected with a connecting inclined block (30), the side surface of each connecting inclined block (30) is fixedly clamped with a buckling block (32), and a second spring (31) is fixedly mounted on the side surface of the buckling block (32), and the other side of the second spring (31) is fixedly connected with a lower die shell (6).
3. An injection molding machine for producing PE pipe connection preforms according to claim 1, characterized in that: the high-temperature blocking device is characterized in that high-temperature blocking devices (10) are arranged on two sides of the connecting vertical plate (8) respectively, each high-temperature blocking device (10) comprises a temperature blocking shell (9), a sliding block (11), a sliding groove (12), a first magnetic adsorption block (15) and a second magnetic adsorption block (16), the sliding groove (12) is formed in the side face of the connecting vertical plate (8), the sliding block (11) is connected to the inside of the sliding groove (12) in a sliding mode, the temperature blocking shell (9) is fixedly installed on the side face of the sliding block (11), the second magnetic adsorption blocks (16) are arranged on two sides of the inner wall of the temperature blocking shell (9) respectively, the first magnetic adsorption blocks (15) are arranged on the side face of the second magnetic adsorption blocks (16), and the connecting vertical plate (8) is fixedly connected to the bottom of the first magnetic adsorption blocks (15).
4. An injection molding machine for producing PE pipe connection preforms according to claim 1, characterized in that: the bottom of the equipment main body shell (1) is fixedly connected with four connecting supporting legs (3), and the bottoms of the connecting supporting legs (3) are provided with idler wheels (4).
5. An injection molding machine for producing PE pipe connection preforms according to claim 1, characterized in that: the bottom fixedly connected with of equipment main body shell (1) extends dead lever (2), two extend the side fixed mounting of dead lever (2) have electric telescopic handle (5), the both sides of equipment main body shell (1) inner wall fixed mounting respectively have spacing piece (27) of supporting, L shape groove (22) have been seted up to the side of spacing piece (27).
6. An injection molding machine for producing PE pipe connection preforms according to claim 2, characterized in that: one side of the inner wall of the wall groove (13) is fixedly provided with a first spring (14), and the other side of the first spring (14) is fixedly connected with a linkage plate (17).
7. An injection molding machine for producing PE pipe connection preforms according to claim 2, characterized in that: four ejecting grooves (33) are formed in the bottom of the lower die shell (6), and ejecting push rods (21) are attached to the inner portions of the ejecting grooves (33).